Twenty-one cube mold



FIG. 1 is a top front right perspective view of a twenty-one cube mold showing my new design;

FIG. 2 is a bottom rear left perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a left elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a cross sectional view taken along line 9-9 in FIG. 4 ; and,

FIG. 10 is a close-up view taken along line 10-10 in FIG. 9 . 

CLAIM The ornamental design for a twenty-one cube mold, as shown and described. 